JP2002031266A - Seismic isolation piping connection structure and its fixed structure - Google Patents

Abstract

(57) [Problem] To appropriately use a joint in a pipe connection direction displaceable / expandable joint such as a ball joint and a universal joint conventionally used in seismic isolation piping technology, and a joint in a pipe connection direction displaceable. [MEANS FOR SOLVING PROBLEMS] For seismic isolation piping,
The universal expansion joints 24 and 28 as expandable joints are used such that the insertion member C of the universal expansion joints 24 and 28 is located on the upstream side of the insertion member D. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a seismic isolation device in which an upper structure such as an upper floor of a building is used for a lower structure such as a lower floor, or a building body as an upper structure is used for a building foundation as a lower structure. In the seismic isolation structure building supported through, the piping on the upper structure side and the piping on the lower structure side
The present invention relates to seismic isolation pipe connection technology that can maintain pipe connection even during an earthquake.

[0002]

2. Description of the Related Art In recent years, seismic measures for buildings have been actively promoted. For example, there are known seismic isolation measures in which seismic isolation devices such as isolators and dampers are interposed between the foundation side of the lower part of the building, such as an underground pit constructed on the ground side, and the main body side of the building where the dwelling parts are provided. Have been. In other words, the ground vibration during the earthquake is absorbed by the seismic isolation device, and the vibration of the earthquake is not transmitted to the building body as it is.

As described above, while seismic measures for the building itself are being actively promoted, seismic measures are also required for the plumbing system for water, sewage, gas and the like. Various seismic isolation piping methods for connecting such piping systems using special joints have been proposed.

For example, Japanese Unexamined Patent Publication No. 10-231972 discloses that an indoor water distribution pipe and an underground water distribution pipe are provided with an expandable and contractible joint body having a spherical convex portion formed on the outer peripheral surfaces of both ends.
There is disclosed a configuration in which seismic isolation piping is connected by a pipe joint including a pair of joint pipes each having a spherical concave portion fitted on the spherical convex portion so as to be able to slide spherically on the inner peripheral surface.

[0005] Further, in this publication, a joint body having a spherical convex portion formed on an outer peripheral surface of one end portion, and a joint pipe having a spherical concave portion fitted to the spherical convex portion so as to be slidable on the spherical surface. Also disclosed is a seismic isolation piping structure in which an indoor water pipe and an underground water pipe are bent by a pipe joint of a pair of pipe joint bodies composed of a pipe joint connected by a swivel.

Japanese Patent Application Laid-Open No. 11-182775 discloses that a pipe fixed to each side of a building base side and a building main body side provided on the building base side via a seismic isolation device is connected. A configuration in which seismic isolation piping is connected via a displaceable joint and an expansion joint is disclosed.

[0007] Japanese Patent Application Laid-Open No. 11-344176 discloses a seismic isolation joint for equipment piping in which a ball joint is connected to one end of a flexible joint pipe and a universal joint to the other end, and ball joints are connected to both ends of a flexible pipe. The configuration of the seismic isolation joint of the equipment piping is disclosed.

[0008] In each of the above-mentioned structures, although the names are different from each other, a joint having a structure called a ball joint or a universal joint is used.
Such ball joints and universal joints are
The connection direction of the pipes connected to each other can be freely selected, and is different from a joint such as an elbow in which the connection direction is fixed in advance.

The ball joint and the universal joint have a substantially common sliding mechanism so that the piping direction can be freely selected. Such a sliding mechanism is
For example, in the ball joint shown in FIG. 1, a pipe connection part 2 is provided at one end of a cylindrical body 1, an insertion member A having an insertion part provided at the other end, and a pipe connection part 2 ′ is provided at one end. An inserted member B having an inserted portion slidably including the inserted portion on the end side.
It is composed of

In the insertion member A, the insertion portion is formed in a partial spherical portion 3 having a partially spherical outer peripheral surface.

As shown in FIG. 1, the inserted member B includes a tubular body 4a and a tubular cover 4b. An inner peripheral surface of the cylindrical body portion 4a is formed as a concave partial spherical portion 5a that slidably includes the convex partial spherical portion 3 (in the state shown in FIG. 1, includes the front half portion 3a), The inner peripheral surface of the cylindrical cover portion 4b is formed as a concave partial spherical portion 5b that slidably includes the convex partial spherical portion 3 (in the state shown in FIG. 1, includes the rear half portion 3b), The concave partial spherical portions 5 of both the cylindrical body portion 4a and the cylindrical cover portion 4b
a and 5b continuously form the inserted portion.

That is, the insertion portion formed on the convex partial spherical portion 3 is slidably inserted into the inserted portion formed on the concave partial spherical portion 5. Therefore, the insertion member A is rotated in the torsional direction along the axial direction with respect to the inserted member B, or is swung with respect to the axial direction of the central axis N, or A swing rotation having both the rotation in the direction and the swing can be caused.

By rotating the insertion member A with respect to the insertion target member B as described above, the insertion member A
And the member B to be inserted,
The pipe connected through the pipe connection portion 2 ′ is connected to the pipe in the connection direction in the pipe direction within the allowable angle range of 360 degrees in the torsional direction and the allowable angle β of the swing angle. Changes will be tolerated.

Therefore, within the range of the predetermined angle, the pipes connected to the insertion member A and the member B to be slidably inserted into each other are connected in the connection direction due to an earthquake or the like. Even if a deformation force such as rotation is generated, it is absorbed and maintained so that the pipe connection portion is not damaged.

The universal joint having the structure shown in FIG. 2 has a sliding mechanism substantially similar to that of the ball joint shown in FIG. In the case shown in FIG. 2, the sliding mechanism section includes a fitting member C in which a pipe connecting portion 12 is provided on one end side of a sliding cylinder 11 and a fitting portion 13 is extendably provided on the other end side. And a mating member D having a mating portion slidably enclosing the mating portion 13 on the other end side.

In the insertion member C, an insertion portion 13 formed at an end of the cylindrical body 11 is formed on a partial spherical portion 15 having a partially spherical outer peripheral surface. As shown in FIG. 2, the inserted member D has a cylindrical body portion 16a and a cylindrical cover portion 16b.
It is composed of The cylindrical body portion 16a has an inner peripheral surface formed in a concave partial spherical surface portion 17a that slidably includes the convex partial spherical portion 15 (in the state shown in FIG. 2, includes the front half portion 15a). Have been.

The cylindrical cover portion 16b has a concave partial spherical portion 17b whose inner peripheral surface slidably includes the convex partial spherical portion 15 (in the state shown in FIG. 2, it includes the rear half portion 15b).
And a cylindrical body portion 16a and a cylindrical cover portion 16b.
Thus, both concave partial spherical portions 17a and 17b are connected to form an inserted portion. That is, the insertion portion 13 formed on the convex partial spherical portion 15 is slidably inserted into the inserted portion formed on the concave partial spherical portion 17 to form a sliding mechanism. .

Therefore, the insertion member C is rotated with respect to the insertion member D in the torsional direction with respect to the axial direction of the central axis N, or the head is swung with respect to the axial direction of the central axis N. It is possible to perform an operation in which the rotation in the torsional direction, the swing in the torsional direction, the swing and the slide are appropriately combined as appropriate.

By rotating the insertion member C with respect to the insertion target member D as described above, the insertion member C
And the pipe connected to the inserted member D,
The connection direction change and expansion / contraction of the pipe direction are allowed within the allowable angle range of 360 degrees in the torsional direction and the allowable swing angle β in the torsional direction, and within the allowable slide range W. It will be.

Therefore, similarly to the ball joint, the pipes connected to the inserting member C and the inserted member D, which are slidably inserted into each other, are deformed by rotation such as rotation in the connection direction due to an earthquake or the like. Even if a force is generated, it can be absorbed and maintained so as not to damage the pipe connection.

[0021]

However, the present inventor has
Ball joints used in conventional seismic isolation piping configurations,
With the universal joint, it has been noticed that the sliding mechanism may not slide smoothly due to the inclusions in the fluid in long-term use due to its sliding mechanism.

For example, in the portion of the ball joint having the structure shown in FIG. 1 which is circled in the drawing, in the portion where the insertion member A and the member B are inserted, the convex partial spherical portion 3 of the insertion portion is formed. Although the slidable insertion is performed by the concave partial spherical portions 5a and 5b of the member B to be inserted, as shown in FIG. 1B, the convex partial spherical portion 3 has a cylindrical body portion 4a. A gap d is provided between the inner surface 4c and the inner surface 4c so that the convex partial spherical portion 3 can be smoothly slid.

Therefore, when a fluid such as water flows in a direction indicated by an arrow Y in FIG. 1A to the insertion portion having the gap d, a part of the fluid is caught in the gap d. . For example, in FIG. 1, when a fluid flows from right to left on the paper, if fine dirt or the like is mixed in the fluid, the fluid may enter the gap d.

If the amount of the mixture is small and the mixture is minute, it is unlikely that the clogging will cause any problem in a short period of time after the application. It has been found that there is a risk that sliding will be difficult due to clogging of the inclusions deposited on the surface.

This is also the case with the universal joint. In the case where the same clogging as described for the above-mentioned ball joint may occur in the small gap d formed between the inserting member C and the inserted member D. It is thought enough.

However, in the above-mentioned publication, there is no recognition at all about the possibility that the gap d may be clogged when the ball joint or the universal joint is used. Conventional examples are such ball joints,
There is no report pointing out the danger of clogging in the gap d in the sliding mechanism of the universal joint.

In the short period of time after use, the possibility of occurrence of such a failure is low, and it is considered that there is no indication of such a problem. However, in the long term after the construction, the possibility of occurrence of such a trouble is sufficiently assumed, and it is necessary to connect pipes in advance so that such trouble does not occur.
Further, depending on the amount, size, etc. of the inclusions in the flowing fluid, occurrence of a failure in a short period of time is sufficiently assumed.

Furthermore, even when clogging does not occur, a part of the fluid is always caught in the gap, so that a rotating force is continuously applied to the partial spherical portions of the insertion members A and C. A situation in which minute vibrations are always applied to the pipe connection portion is sufficiently assumed.

That is, although the prior art discloses that seismic isolation piping can be performed by using a ball joint and a universal joint, the use of such a ball joint and a universal joint is smooth after construction. No consideration has been given to the mounting method for ensuring the function of the ball joint and universal joint.

From the viewpoint of maintaining the initial quality of the seismic isolation piping for a long time after the construction, the present inventor studied the connection structure of the seismic isolation piping for the first time based on the sliding mechanism of the ball joint and the universal joint. The present invention has been found to have an appropriate form of use.

Further, in the above-mentioned conventional example, with regard to the installation method on the indoor piping or the buried piping side when using a joint such as a ball joint or a universal joint, any mounting method can be used for these ball joints,
There is no sufficient study on the best mode for seismic isolation piping using universal joints.

Further, the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-231972
In the official gazette, a ball joint is attached to both ends so as to rotate in the axial direction (to rotate in the torsion direction) or to swing the head (to rotate in the off-axis direction), and a swivel is mounted at the center. Is installed to provide seismic isolation piping.

This seismic isolation pipe is attached to the seismic isolation layer of the seismic isolation building (the layer where the building is supported by the seismic isolation device made of laminated rubber). By providing ball joints on both sides and a swivel in the center, it can move in a wide range in the horizontal direction, and can absorb horizontal displacement during an earthquake.

However, this publication does not disclose any technical matter regarding the vertical displacement of the building, and when a vertical displacement occurs in the seismic isolation layer, excessive stress is applied to the swivel portion. There is a strong possibility that such a problem may occur, and it is strongly desired to provide an appropriate technique to cope with such a case.

When an excessive stress is generated in the swivel portion, for example, the vertical load applied to the laminated rubber increases as the upper floor is constructed. Accordingly, the laminated rubber shrinks in the vertical direction, and as a result, the building may sink. Alternatively, if the acceleration in the vertical direction is large due to the earthquake, the building may sink instantaneously. Alternatively, the building may move up and down due to the expansion and contraction of rubber due to daily temperature changes during the year. Alternatively, the building may sink due to creep of the laminated rubber.

In the connection of pipes in consideration of such vertical displacement, it is not enough to support only the weight of the pipe, and a technique of resisting a reaction force (for example, a moment generated in a ball joint) generated from the pipe is not enough. Development is required. Regarding this point, in the related art, there is no technical disclosure regarding the reaction force and the method of supporting the dead weight of the pipe.

An object of the present invention is to appropriately use a ball joint, a universal joint, etc., which are conventionally used in seismic isolation piping technology, in a pipe connection direction displaceable / expandable joint, and a pipe connection direction displaceable joint. It is in.

An object of the present invention is to provide a seismic isolation piping technology using a ball joint and a universal joint.
An object of the present invention is to properly fix a piping side such as an indoor pipe or a buried pipe.

An object of the present invention is to make it possible to appropriately support a pipe against vertical displacement.

[0040]

SUMMARY OF THE INVENTION According to the present invention, a fitting member is rotatably held inside a fitting member provided with a pipe connecting portion, and a pipe having a piping connecting portion is provided inside the fitting member. The upper structure of the structure is connected to the lower structure via the seismic isolation device by using a joint that can be displaced and expanded in the pipe connection direction, which is allowed to bend and expand and contract in the pipe connection direction by being slidably held in Displaceably supported, an upper structure side pipe provided in the upper structure, and a lower structure side pipe or buried pipe provided in the lower structure is connected to a seismic isolation pipe connection structure, At each connection end of the upper structure-side pipe and the lower structure-side pipe or the buried pipe, the pipe connection direction displacement / expandable joint is arranged such that the insertion member is located upstream with respect to the inserted member. Located so that both said Piping between the pipe connection direction displacement-stretchable joint, characterized in that it is interposed.

According to the present invention, the insertion member is rotatably held inside the inserted member provided with the pipe connection portion, and the pipe having the pipe connection portion is slidably held inside the insertion member. By this, the pipe connection direction displacement and expansion / contraction joints in which the bending and expansion and contraction of the pipe connection direction are allowed, and the insertion member having the pipe connection portion inside the inserted member provided with the pipe connection portion are rotated. The upper structure of the structure is supported by the lower structure via the seismic isolation device so as to be relatively displaceable using the pipe connection direction displaceable joint and the upper structure side piping provided in the upper structure. A seismic isolation pipe connection structure in which a lower structure side pipe or a buried pipe provided in the lower structure is connected, wherein a connection end of the upper structure side pipe is displaceable and expandable in the pipe connection direction. Fitting or piping connection direction When one of the movable joints is connected, and the other end is connected to the connection end of the lower structure side piping or the buried piping, when connecting the piping connection direction displaceable / expandable joint, the piping connection direction displaceable joint Is characterized in that, in both joints, the insertion member is provided so as to be located on the upstream side with respect to the inserted member, and piping is interposed between the two joints.

According to the present invention, a pipe connection direction displaceable joint in which a fitting member having a piping connection portion is rotatably held inside a member to be fitted provided with a piping connection portion is provided on an upper portion of a structure. The structure is supported by the lower structure via a seismic isolation device so as to be relatively displaceable, and the upper structure side piping provided in the upper structure is connected to the lower structure side piping or the buried piping provided in the lower structure. It is a piping connection structure for seismic isolation,
At each connection end of the upper structure side pipe and the lower structure side pipe, the pipe connection direction displaceable joint is provided such that the insertion member is located on the upstream side with respect to the inserted member. A pipe is interposed between the joints that can be displaced in the pipe connection direction.

In the pipe connection direction displacement / expandable joint, the insertion member and the inserted member can be swung by at least 15 degrees with respect to one central axis direction with respect to the other central axis direction. Inserted, the upper structure side pipe, the distance between the rotation centers of the two joints provided at each connection end of the lower structure side pipe or the buried pipe is L, the initial elongation at the time of construction of both joints is d0, the maximum elongation amount is d1, the horizontal displacement is D, if the amount of rotation was ^{θ, d1 ≧ d0 / 2 +} D 2 / {2 (2L + d0)} ≧ 4
(Cm) wherein the maximum elongation d1 is satisfied.

According to the present invention, the upper structure of the structure is supported by the lower structure via a seismic isolation device so as to be relatively displaceable, and the upper structure side horizontal pipe provided in the upper structure and the lower structure are provided in the lower structure. The lower structure side horizontal pipe or the buried horizontal pipe can be displaced in at least three pipe connection directions in which the insertion member having the pipe connection part is rotatably held inside the inserted member provided with the pipe connection part. A bent pipe portion is provided and connected between the upper structure side horizontal pipe and the lower structure side horizontal pipe or the buried horizontal pipe with a joint and at least one of an elbow and a straight pipe interposed therebetween. It is characterized by being.

[0045] The insertion member of the pipe connection direction displaceable joint is provided so as to be located on the upstream side with respect to the insertion target member. The lower structure side horizontal pipe is fixed to the lower structure side, and is separately supported by a pipe displacement support member separately from a fixing portion to the lower structure side.

The fixing structure in the seismic isolation pipe connection structure according to any one of the above aspects of the present invention, wherein the upper structure side horizontal pipe part of the upper structure side pipe is fixed to the upper structure, and the lower structure side pipe of the lower structure side. A side horizontal piping portion is fixed to the lower structure. When fixing the upper structure side horizontal piping portion to the upper structure, a fixing member including a fixing portion fixed to the upper structure side and a pipe support portion fixed in a cross direction with respect to the fixing portion is provided. hand,
In a state where the fixing portion is fixed to the upper structure side, the upper structure side horizontal piping portion is supported by the pipe support portion, and the pipe end connection portion in the pipe end side pipe connection of the upper structure side horizontal piping portion is It is characterized by being fixed to a pipe support.

In any of the above arrangements, by providing the insertion member so as to be located on the upstream side with respect to the member to be inserted, it is possible to prevent the clogging failure due to the inclusion of the fluid flowing in the pipe. it can.

[0048]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of a ball joint as a joint capable of displacing in a pipe connection direction used in the present invention. FIG. 2 is a cross-sectional view showing a configuration of a universal joint as a joint in the pipe connection direction that can be displaced and expandable used in the present invention.

As shown in FIG. 1, the ball joint used in the present invention includes a pipe connecting portion 2 provided at one end of a cylindrical body 1 and a fitting member A having a fitting portion provided at the other end thereof. And an inserted member B having an inserted portion slidably enclosing the inserted portion on the other end side.

The insertion member A is provided with a flange 2a as a pipe connection portion 2 at one end of the cylindrical body 1 as a pipe connection portion, and the insertion portion at the other end has a partially spherical portion whose outer peripheral surface is convex. It is formed on the spherical portion 3.

As shown in FIG. 1, the inserted member B includes a cylindrical body 4a and a cylindrical cover 4b. The cylindrical body portion 4a is provided with a flange 2'a as a pipe connection portion 2 'at one end of the cylindrical end, and the inner peripheral surface of the other end is slidable on the convex partial spherical portion 3. (In the state shown in FIG. 1, the first half 3a is included)
It is formed on the concave partial spherical surface portion 5a, and a flange 6a is provided on the outer peripheral surface on the other end side.

The cylindrical cover portion 4b has a concave partial spherical portion whose inner peripheral surface slidably includes the convex partial spherical portion 3 (in the state shown in FIG. 1, the rear half portion 3b is included). 5b
And a flange 6b is formed on the outer peripheral surface.

The cylindrical body portion 4a and the cylindrical cover portion 4b having such a configuration are connected by connecting the flanges 6a and 6b with bolts, and as shown in FIG. 1, the cylindrical body portion 4a and the cylindrical cover portion are provided. 4b, both concave partial spherical portions 5a,
5b are continuous to form the inserted portion. That is, the insertion portion formed on the convex partial spherical portion 3 is slidably inserted into and held by the inserted portion formed on the concave partial spherical portion 5.

In the ball joint having such a structure, the inserting member A is rotated in the torsional direction with respect to the inserted member B with respect to the axial direction of the central axis N, or the axial direction of the central axis N is changed. , Or a swaying rotation having both the rotation in the torsional direction and the swaying can be caused.

By rotating the insertion member A with respect to the member B to be inserted as described above, the insertion member A
And the member B to be inserted,
The pipes connected via the pipe connection part 2 are connected with each other by an allowable rotation angle α in a torsion direction (for example, 360 ° in the case of FIG. 1) and an allowable swing angle β (for example, FIG.
In the case shown in (1), the change of the connection direction in the pipe direction is allowed within the allowable angle range of 30 °). Note that the allowable rotation angle α in the torsional direction and the allowable swing angle β do not need to be limited to the above ranges, and may be set as necessary. In this way, refraction in the pipe connection direction is allowed.

As shown in FIG. 2, the universal joint used in the present invention has a pipe connecting portion 12 provided at one end of a slidable tubular body 11 and an insertion fitting portion 13 provided at the other end thereof so as to be extendable and contractible. It is composed of an insertion member C and an insertion member D having a pipe connection portion 14 at one end and an insertion portion slidably enclosing the insertion portion 13 at the other end.

The insertion member C is provided with a flange 12a as a pipe connection portion 12 at one end of the cylindrical body 11 as a pipe connection portion, and the insertion portion 13 at the other end has a partially spherical outer peripheral surface. It is formed on the partial spherical portion 15.

As shown in FIG. 2, the inserted member D is composed of a tubular body 16a and a tubular cover 16b. The cylindrical body part 16a is provided with a flange 14a as a pipe connection part 14 at one end of the cylindrical end, and the inner peripheral surface of the other end side slidably includes the convex partial spherical part 15 (see FIG. 1). In the state shown in FIG. 2, the front half portion 15a is included) (a concave spherical surface portion 17a), and a flange 18a is provided on the outer peripheral surface on the other end side.

The cylindrical cover portion 16b has a concave partial spherical surface portion in which the inner peripheral surface slidably includes the convex partial spherical portion 15 (in the state shown in FIG. 2, the rear half portion 15b is included). 17b, and a flange 18b is formed on the outer peripheral surface.

The cylindrical body portion 16a and the cylindrical cover portion 16b having such a configuration are connected by connecting the flanges 18a and 18b with bolts, and as shown in FIG. The two concave partial spherical portions 17a, 17b of the cover 16b are continuous to form the inserted portion. That is, the insertion portion 13 formed on the convex partial spherical portion 15 is slidably inserted into the inserted portion formed on the concave partial spherical portion 17.

The universal joint having such a structure is as follows.
As shown in FIG. 2, the inserted member C is
Is rotated in the torsional direction along the axial direction of the central axis N, or is swung along the axial direction of the central axis N,
Alternatively, the user can slide back and forth, or perform a swing rotation in which the twist in the torsional direction, the swing, and the slide are appropriately selectively combined.

By rotating the insertion member C with respect to the insertion target member D as described above, the insertion member C
The pipe connected via the pipe connection part 12 of the member D and the pipe connected via the pipe connection part 14 of the member D to be inserted have an allowable rotation angle α in the torsion direction (for example, FIG. 2). In this case, 360 °), the swing allowable angle β (for example,
In the case shown in FIG. 2, the connection direction in the pipe direction is changed or expanded or contracted within the allowable angle range of 30 °) and within the allowable slide range W (for example, 80 mm in the case of FIG. 2). Will be allowed.

According to the present invention, a seismic isolation pipe connection structure is constructed by using the ball joint having the above-described structure as a joint capable of displacing in the pipe connection direction and using the universal joint as a joint capable of being displaced and expandable in the pipe connection direction.
Known commercially available products may be used for the pipe connection direction displaceable / expandable joint and the pipe connection direction displaceable joint having such a configuration. For example, a universal expansion joint (abbreviation: UE joint) manufactured by U-Joint may be used as the universal joint.

(Embodiment 1) In this embodiment, FIG.
As shown in the figure, the building body side E as the superstructure side of the building
The seismic isolation device such as an isolator and a damper (not shown)
In a structure such as a seismic isolation building constructed through a structure, an upper structure side pipe 21 on the building body side such as an indoor pipe, and a lower structure side pipe 22 on the building foundation side as a lower structure side of the building
And seismic isolation pipes are connected on the assumption that fluid flows from the upper structure side pipe 21 side to the lower structure side pipe 22 side.

In FIG. 3, the horizontal pipe 21 on the upper structure side running horizontally is displaced via an elbow 23 in the pipe connection direction.
It is connected to the universal expansion joint 24 described above, which is a telescopic joint. The upper structure side horizontal pipe 21 and the elbow 23 are
The pipes are connected by connecting the pipes a and 23a, and the flange connection portion 25 is fixed to a pedestal 26 fixed to the building body side E.

The pedestal 26 is composed of a flat fixing portion 26a attachable to a flat portion on the building body side E and a plate-like pipe supporting portion 26b hanging down from the fixing portion 26a. It is formed so as to be fixed via a plate buttress 26c. A through hole is provided in the plate-like pipe support portion 26b, and the upper structure side horizontal pipe 21 is horizontally held on the building body side E by inserting the pipe end of the upper structure side horizontal pipe 21 into this through hole. ing.

With the upper structure side horizontal pipe 21 held horizontally by the pipe support portion 26 as described above, the pipe ends of the upper structure side horizontal pipe 21 are connected to the flange 21a, the flange 23a of the elbow 23, and the plate-like shape. It is bolted together with the pipe support 26b. That is, the pipe support 26
b has not only a pipe support function of the upper structure side horizontal pipe 21 but also a flange fixing function with the flange 21a.

In this way, the flange connecting portion 25 is fixed to the pipe supporting portion 26b of the pedestal 26 fixed to the building body E, and the upper structure side horizontal pipe 21 is fixed to the building body E. Become. By adopting such a fixing structure, the pipe supporting portion 26b also has a flange fixing function.
As shown in FIG. 3, there is an axial force N from below to above, a shearing force in the direction facing the plate surface of the pipe support 26b (which becomes a shearing force for the straight pipe 27 described below) Q, and a moment. M works, but since the pipe support portion 26b is fixed to the fixing portion 26a fixed to the building body side E as described above, even if an earthquake occurs, the axial force N, shear force Q,
The pipe connection structure can be maintained sufficiently in response to the moment M.

The elbow 23 and the universal expansion joint 24 are connected to the flange 23 of the elbow 23.
b and Universal Expansion Joint 2
The pipe connection is made by flange-connecting a flange 12a as a pipe connection portion 12 on the side of the insertion member C of No. 4. That is, the universal expansion joint 24 is used in such a manner that the insertion member C constituting the universal expansion joint 24 is located on the upstream side of the insertion target member D, and one of the characteristic configuration points of the present invention. It is.

When the universal expansion joint 24 is used with the member D to be inserted positioned upstream of the member C, fluid such as water is
It flows in the direction indicated by arrow X in FIG.

In the portion where the insertion member C of the universal expansion joint 24 and the member D to be inserted are fitted, the convex partial spherical portion 15 of the insertion portion 13 is connected to the member D to be inserted.
Is slidably inserted by the concave partial spherical surface portion 17 of FIG. 2, but as shown in FIG.
A gap d is provided between the cylindrical body portion 16a and the inner surface 16c so that the convex spherical portion 15 can slide smoothly.

For the insertion portion having such a gap d,
When a fluid such as water flows in a direction indicated by an arrow Y in FIG. 2A, a part of the fluid may be caught in the gap d. Therefore, when solids are mixed in the fluid,
Even if it is fine, there is a possibility that such solid matter accumulates in the gap d over a long period of time, and eventually hinders smooth sliding of the convex partial spherical portion 15. The inventor has noticed.

Therefore, as in the present invention, the universal
The insertion member C side of the expansion joint 24 is
If it is used so as to be at the upstream position of the inserted member D, FIG.
As shown by the arrow X in (A), the fluid flows in the forward direction, and there is no danger of the fluid flowing in the gap d. Therefore, even if there is a contaminant in the fluid, it is possible to prevent the gap d from being clogged as compared with the case where the fluid flows in the opposite direction indicated by the arrow Y. For example, even if the contaminant in the fluid is clogged in the gap d, it is washed away by the fluid that flows all the time in the forward direction, and the clogging can be eliminated.

The use of the universal joint for the seismic isolation piping has been disclosed in various publications as described above, however, based on the structure of the above-mentioned inserted portion of the universal joint, it is possible to prevent clogging at that portion. From the viewpoint, no consideration is given to the configuration for defining the use state of the universal joint, and the present inventor has found it for the first time.

In this manner, the universal expansion joint 24 connected to the elbow 23 by piping so that the insertion member C is located at a position upstream of the insertion member D is located on the side of the insertion member D. On the side of the pipe connection part 14 of
The pipe is connected to a straight pipe 27 that is vertically piped. The universal expansion joint 24 and the straight pipe 27 are formed by connecting the respective flanges 14a, 27a by flanges.

A straight pipe 27 whose upper end is flange-connected to the universal expansion joint 24
The lower pipe end is further connected to the universal expansion joint 28 by piping. In addition,
The universal expansion joint 28
Above universal expansion joint 24
It has the same configuration as

The pipe connection with the lower pipe end side universal expansion joint 28 is made by a straight pipe 2
7 and the flange 12a on the insertion member C side of the universal expansion joint 28.
And flange connection. Such straight pipe 2
7 and the universal expansion
Also at the time of connection with the joint 28, the insertion member C is used so as to be located at a position upstream of the insertion member D.

Further, the universal joint 28 has an elbow 29 and a flange 1 on the inserted member D side.
The pipes are connected by flange connection of 4a and 29a. The other end of the elbow 29 is connected to the lower structure side horizontal pipe 22a, which is the lower structure side pipe 22, by flange connection with both flanges 29b, 22b and connected to the lower structure side horizontal pipe 22a. As shown in FIG. 3, the lower structure side horizontal pipe 22 a is fixed to a pipe mounting base 31 fixed to the building foundation side G with a band 32.

Thus, the upper structure side horizontal pipe 21
a (21) and the lower structure side horizontal pipe 22a (22)
Seismic isolation piping is connected via an elbow 23, a universal expansion joint 24, a straight pipe 27, a universal expansion joint 28, and an elbow 29, and fluid flows from the upper structure side horizontal pipe 21a to the lower structure side horizontal pipe 22a. It is flowing.

In the seismic isolation pipe having such a configuration, the building body E
And the building foundation side G is, for example, left and right, front and rear,
That is, even if the relative displacement is performed in the plane direction, the respective inserted members D of the universal expansion joints 24 and 28 are connected to the respective insertion members C flange-connected to the elbow 23 and the straight pipe 27 by piping. Performs a rotational motion appropriately intersecting the swinging rotation and the twisting direction rotation with respect to the connection direction, and the insertion member C slides with respect to the insertion target member D to absorb vibration, and disconnection of the pipe connection portion. No damage is caused.

When vibration in the vertical direction occurs between the building body side E and the building foundation side G, the elbow 23,
The insertion members C of the universal expansion joints 24 and 28 flange-connected to 29 respectively slide with respect to the insertion member D and act to absorb vertical vibration.

In the above description, the seismic isolation of plane vibration and the seismic isolation of vertical vibration in the seismic isolation pipe of the present embodiment are described separately. Since the vibration is generated, the seismic isolation function in both the surface direction and the vertical direction is combined to achieve the vibration absorbing function of the seismic isolation pipe, and the seismic isolation function is exhibited.

In the above description, the mounting method for fixing the flange connecting portion 25 between the upper structure side pipe 21 and the elbow 23 to the pipe mounting base 26 has been described.
The side a may be fixedly attached to the building foundation side with the band 32.

Similarly, in the lower structure side horizontal pipe 22a, for example, as shown in FIG.
May be fixed to the building foundation side G via the. In the case shown in FIG. 4, the elbow mounting base 33 is, for example, a building foundation side G.
Plate-shaped elbow mounting base plate 33a fixed on top
And an elbow fixing member 33b fixed to the elbow mounting base plate 33a. The elbow 29 may be fixed to the elbow fixing member 33b of the elbow mounting base 33.
If the elbow 29 side can be securely fixed in this way, the fixing of the lower structure side horizontal pipe 22a can be omitted.

In the connection of the seismic isolation pipe as shown in FIG. 3, the universal expansion joint 2
In Nos. 4 and 28, when a pressure (for example, water pressure) is applied to the inside thereof, a seal portion attached inside is deformed to generate a rotational force when rotational displacement occurs, and an elongation force is generated in a connection direction due to a change in cross section. . The frictional force and the elongational force generate a reaction force at the mounting portion.

However, even in such a case, as shown in FIG. 3, since the lower structure side horizontal pipe 22a is fixed by the band 32 via the pipe mounting base 31, shearing force and axial force are generated in the pipe. Although a moment is generated in the mounting portion, the axial force, shearing force, and moment can be eliminated by fixing with the band 32. Regarding the elimination of the axial force, the shearing force and the moment, the lower structure side horizontal pipe 22a may be attached and fixed to the elbow 29 as shown in FIG. 4 or the flange connecting portion of the elbow 29 and the lower structure side horizontal pipe 22. It is the same even if is fixed.

In a vibration-isolated pipe as shown in FIG. 3, the pipe deforms and absorbs vibrations generated by an earthquake or the like. It was thought that it was necessary to consider in advance the amount of vibration rotation or amount of expansion and contraction.

In the conventional seismic isolation pipe connection structure, since a configuration is considered in which a universal joint and a ball joint which are already on the market are used and used, the seismic isolation function of the seismic isolation pipe is not used. This is regulated by the allowable swing angle of the universal joint or the amount of expansion and contraction. However, the present inventor considered that it is necessary to obtain a function necessary for deformation during vibration absorption during an actual earthquake from a universal joint, a ball joint, and the like.

From this viewpoint, for example, in the embodiment of the present invention, by observing the deformation state of the seismic isolation pipe shown in FIG. We examined what kind of function we wanted.

In the study, the following preconditions were set. That is, the present invention is applied to a base-isolated building using the base-isolated device, but the amount of horizontal displacement of the base-isolated building is restricted by the deformation performance of the base-isolated device. Generally, a seismic isolation device with a maximum deformation capacity of 50 cm is used, so by setting the horizontal displacement amount to 50 cm,
The study was conducted in the range of high practicality.

The seismic isolation piping is used in an underground seismic isolation pit provided on the foundation side of the building where the seismic isolation device is installed.
It is necessary to specify the height of the seismic isolation pit because it connects the pipes on the building body side and the pipes buried in the area from the bottom to the ground on the building foundation side. is there. The height of the commonly used seismic isolation pit is 200
cm or less, the height of the seismic isolation pit was set to 200 cm, and the study was conducted within a practical range.

FIG. 5A shows the height (c) of the seismic isolation pit.
m) and the allowable swing angle of the universal joint (degree)
Is shown as a graph. From FIG. 5A, it can be seen that when the height of the seismic isolation pit is 200 cm, the swingable allowable angle is about 14 degrees. So 1
If the angle is set to 5 degrees or more, in the seismic isolation pipe connection structure having the configuration shown in FIG.
It can be seen that it can be set to m or less.

On the other hand, as shown in FIG. 5 (B), the hypotenuse of the right-angled triangle when one of the two sides sandwiching the right angle has a horizontal displacement of 50 cm and the other side has a seismic isolation pit height of 200 cm , 206.2 cm. The length of the hypotenuse is determined by connecting a universal joint connected to the main body side pipe as the upper structure side pipe and a universal joint connected to the base side pipe as the lower structure side pipe via a straight pipe. In the seismic isolation pipe, the total expansion and contraction of the two universal joints is shown when the horizontal displacement is matched by 50 cm during the earthquake.

In consideration of the fact that two universal joints are used, the amount of elongation per universal joint is calculated as (206.2-20)
0) /2=3.1 (cm). That is, in simple calculations, the universal joint is 3.1.
If the elongation amount can be set more than 200 cm, the pit height will be 200
It can be seen that when the horizontal displacement amount is set to 50 cm and the horizontal displacement amount is set to 50 cm, the function of the seismic isolation pipe capable of exhibiting the seismic isolation function in a practical range can be secured.

FIG. 5C is a graph showing the relationship between the allowable swing angle of the universal joint and the amount of expansion and contraction of the universal joint obtained by an actual experiment. FIG.
From the graph of (C), it can be seen that the elongation amount is 3.3 cm when the allowable angle is 15 degrees. Therefore, if the elongation is set to 4 cm or more, it can be seen that at least 15 degrees at an allowable swing angle of 15 degrees or more required for a universal joint or the like in the above practical condition range are satisfied.

From the above results, the seismic isolation pipe according to the present invention in which the universal joint connected to the upper structure side pipe and the universal joint connected to the lower structure side pipe are connected via a straight pipe between them. It can be seen that in order for the seismic isolation function to be sufficiently exerted in a practical range, the allowable swing angle of the universal joint or the ball joint used must be 15 degrees or more.

In particular, in the case of a universal joint,
It can be seen that setting the allowable swing angle to 15 degrees or more and the amount of expansion and contraction to 4 cm or more is a sufficiently practical range.

More specifically, as shown in FIG. 6, the height between the building body side E and the building foundation side G is H, and the universal expansion joint 28 is extended from the building foundation side G as shown in FIG. The distance from the center of rotation of the inserted portion of the inserted member C and the inserted member D to the center of rotation is h1, and the building body side E
To Universal Expansion Joint 24
The distance between the insertion member C and the inserted member D to the center of rotation of the inserted portion is h2.

When the seismic isolation piping as shown in FIG. 6 is performed, the initial extension amount of the insertion member C of the universal expansion joint 24 with respect to the insertion member D is d0.
The possible elongation at the time of absorbing vibration is d1. Further, the distance between the centers of rotation of the inserted portions of the universal expansion joints 24 and 28 formed by the insertion member C and the inserted member D is L, and the horizontal displacement of the universal expansion joint 28 is D. And the possible rotation amount is θ.

[0100] If such is possible elongation amount d1 ^{is, d1 ≧ d0 / 2 + D} 2 / {2 (2L + d0)} ≧ 4
(Cm) It may be set so as to satisfy the value given by the above equation. For d0 calculated from this equation, the mounting accuracy,
The actual design elongation may be set in consideration of the safety factor in consideration of the vertical creep amount.

In the first embodiment, the main body of the building is described as the upper structure of the building, and the building foundation is described as the lower structure. For example, in the middle floor of the building, the upper structure is the upper floor portion and the lower floor is the lower floor. It is needless to say that the present invention can be applied to connection of respective pipes when the structure is a lower floor portion and the upper and lower floors are provided above and below via a seismic isolation device. Further, as the lower structure side piping, the piping provided on the building foundation side has been described as an example, but the lower structure side piping may be a buried piping. Furthermore, the buried pipe may be a buried horizontal pipe that runs sideways.

(Embodiment 2) In the present embodiment, a description will be given of a case where a bending seismic isolation pipe is formed by using the ball joint having the above-described configuration as a pipe connection direction displaceable joint.

In the present embodiment, a building body side E as the upper structure side of the building and a building foundation side G provided on the ground side as the lower structure side are connected to a seismic isolation device such as an isolator or a damper (not shown). In the case of a base-isolated building constructed through the structure shown in FIG.
And the lower structure side pipe 42 on the building foundation side is shown in FIG.
As shown in the figure, the seismic isolation pipe is connected on the assumption that fluid flows from the upper structure side pipe 41 to the lower structure side pipe 42. FIG. 8 shows a plan configuration of the seismic isolation pipe connection shown in FIG. 7A, and FIG. 7A is a view taken along the line AA in FIG.

In FIG. 7A, the horizontal pipe 41 on the upper structure side running horizontally is attached to the mounting base 4 fixed to the building body side E.
3 is fixedly attached to the band 3 with a band 44 (for example, U bolt). The pipe end of the upper structure side horizontal pipe 41 is a ball joint 45 having the above-described configuration as a joint capable of displacing in the pipe connection direction.
It is connected to the. At the time of the pipe connection with the ball joint 45, the flange 2a as the pipe connection portion 2 of the insertion member A constituting the ball joint 45 and the flange 41a of the upper structure side horizontal pipe 41 are connected by flange connection. I have.

In this connection state, the ball joint 4
5 are connected so that the insertion member A side is located upstream of the insertion member B. At the portion of the ball joint 45 where the fitting member A and the fitting member B are fitted, the convex partial spherical portion 3 of the fitting portion is replaced with the concave partial spherical portion 5 of the fitting member B.
a and 5b are slidably inserted.
As shown in (B), a gap d is provided between the convex partial spherical portion 3 and the inner surface 4c of the cylindrical body portion 4a, so that the convex partial spherical portion 3 can slide smoothly. ing.

Therefore, when a fluid such as water is caused to flow in the direction indicated by the arrow Y in FIG. 1 (A) to the insertion portion having the gap d, a part of the fluid may be caught in the gap d. . Therefore, when solids and the like are mixed in the fluid, even if the solids are fine, such solids accumulate in the gap d for a long period of time, and eventually become convex. The possibility that the smooth sliding of the partial spherical portion 3 may be prevented,
The inventor has noticed.

Therefore, if the insertion member A side of the ball joint 45 is used so as to be located upstream of the insertion member B as in the present invention, as shown by the arrow X in FIG. The fluid flows in the forward direction, and the fluid does not catch on the gap d.

Therefore, even if there is a contaminant in the fluid, clogging of the gap d can be prevented from occurring, as compared with the case where the fluid is caused to flow in the opposite direction indicated by the arrow Y. For example, even if the contaminant in the fluid is clogged in the gap d, it is washed away by the fluid that flows all the time in the forward direction, and the clogging can be eliminated.

Use of ball joints for seismic isolation piping
Conventionally, as described above, various publications disclose, however, based on the structure of the above-mentioned inserted portion of the ball joint, from the viewpoint of preventing clogging at that portion, a configuration that defines the use state of the ball joint is described. No consideration has been made, and the present inventor has found it for the first time.

In this way, the upper structure side pipe 41 is set so that the insertion member A is located at a position upstream of the insertion member B.
The ball joint 45 connected to the insertion member A side
The pipe B is connected to the straight pipe 46 on the inserted member B side. The straight pipe 46 and the inserted member B side of the ball joint 45 are connected by flange-connecting the flange 46a of the straight pipe 46 and the flange 3a on the inserted member B side.

The straight pipe 46 is further connected to the elbow 47 by flange connection of flanges 46b and 47a, respectively, and the laying direction of the pipe is directed vertically downward. The lower end of the elbow 47 is connected to the ball joint 48 by piping. The flange 47b of the elbow 47 and the flange 2a of the ball joint 48 on the insertion member A side are flange-connected. Also in this case, the ball joint 4
8 is used so that the insertion member A is located on the upstream side as described above.

The inserted member B side of the ball joint 48 is further attached to the elbow 49 by the two flanges 3a, 49a.
Are connected by pipes by flange connection, and the pipe direction is changed in the horizontal direction by 90 ° as shown in FIG.
The elbow 49 is further connected to the straight pipe 51 by flange connection with the flanges 49b and 51a, respectively, and is connected in a laterally running pipe. As shown in FIG. 7 (A), the straight pipe 51 is supported by a pipe support 52 raised from the building foundation side G.

The contact surface of the pipe support 52 with the straight pipe 51 is
The surface is formed smoothly, and the straight pipe 51 is
When displaced in the direction perpendicular to the plane of FIG. 7A, the pipe serves as a pipe displacement support as a member so that the straight pipe 51 can slide on the pipe support 52 in the horizontal direction.

The straight pipe 51 further includes a ball joint 53
The flanges 51b and 2a are flanged and connected to the insertion member A side of the pipe. The inserted member B side of the ball joint 53 is connected to the lower structure side horizontal pipe 42 a as the lower structure side pipe 42 by the flanges 3 a, 42.
The pipe is connected by flange connection by a. The lower structure side horizontal pipe 42a is mounted and fixed via a band 44 to a pipe mounting base 43 fixed to the building foundation side G.

In the seismic isolation pipe having such a configuration, the horizontal vibration absorption during an earthquake is mainly caused by the horizontal swinging rotation of the horizontally mounted ball joints 45 and 53, and the vertically mounted ball joint 48. Will be absorbed by the torsional rotation along the longitudinal axial direction. FIG. 9 shows a state in which the seismic isolation layer moves in the X and Y directions in the seismic isolation pipe having the configuration shown in FIG. When one end of the pipe moves in the X and Y directions, the ball joints 45 and 53 at both ends perform off-axis rotation (oscillating rotation). The ball joint 48 provided in the vertical direction rotates in the torsional direction.

FIG. 10 shows a case where a base-isolated building as a structure sinks vertically, that is, vertically. In this case, the ball joints 45 and 48 rotate in the off-axis direction, and absorb the squat displacement, that is, the vertical vibration.

Note that, in the configuration shown in FIG.
1 is supported by the pipe support 52 fixed to the building foundation side G, but instead of such a configuration, for example, as shown in FIG.
May be supported by the suspending support 54 supported by the support. Also in this case, the straight pipe 46 is supported so as to be able to slide on the hanging support 54 smoothly.

In the above description, a case was described in which the elbow 47, the ball joint 48, and the elbow 49 were continuously connected by piping. For example, as shown in FIG. In between, a straight pipe P may be interposed so that the pipe height can be adjusted. Of course, the straight pipe P may be interposed between the ball joint 48 and the elbow 49.

(Embodiment 3) In Embodiment 3, as shown in FIG.
A case where a flexural seismic isolation pipe is configured by using 7, 58 will be described. In the present embodiment, unlike the configuration shown in FIG. 7A, a band 44 is attached to the mounting base 43 on the building body side E.
Is connected to a ball joint 56 via an elbow 59, and the ball joint 56 is further connected to a straight pipe 62 via an elbow 61. The straight pipe 62 is suspended and supported on the building body side E via an extendable spring 63a.

The straight pipe 62 is connected to a ball joint 57 via an elbow 63, and the ball joint 57 is further connected to a straight pipe 65 via an elbow 64. The straight pipe 65 is connected to the ball joint 58 via an elbow 66, and the ball joint 58 is connected to the elbow 6
7 is connected to the lower structure side pipe 42 by piping.
The lower structure side pipe 42 is attached and fixed to a mounting base 43 fixed to the building foundation side G with a band 44.

FIG. 13 is a plan view of a flexural seismic isolation pipe having such a configuration. The side view of FIG. 12 is a side view when viewed along the arrow BB direction of FIG.

Also in the configuration of the present embodiment shown in FIGS. 12 and 13, the ball joints 56, 57 and 58 are used such that the insertion member A is always on the upstream side with respect to the insertion target member B. Have been. Even in seismic isolation piping with this configuration,
The torsional rotation of each ball joint along the axial direction and the vertical swinging rotation absorb vibration in the vertical and horizontal directions of the pipe, and the spring 63a can restore the pipe position.

In the same manner as described with reference to FIG. 7B, in FIG. 12, a straight pipe P may be interposed between the elbow 63 and the ball joint 57 for height adjustment. Further, the portion where the straight pipe P is interposed is located between the elbow 59 and the ball joint 56, the ball joint 56.
Between the ball joint 57 and the elbow 64
Between the elbow 66 and the ball joint 58, or between the ball joint 58 and the elbow 67, or at one or more places.

The present invention is not limited to the above embodiment, but may be changed as needed. In the above description, the case where the flexural seismic isolation pipe is configured using only the universal joint (universal expansion joint) or only the ball joint has been described. -The joint and the ball joint may be used in combination.

The number of universal expansion joints or ball joints used in the seismic isolation piping is not limited to the above description, and an appropriate number may be used as needed.

In the above description, the universal joint,
Although a pipe connection direction displacement / expandable joint called a ball joint, and a pipe connection direction displaceable joint were used, as long as they have the same configuration having a slidable insertion member and a member to be inserted, Regardless of the name, the present invention can be applied to its use.

[0127]

According to the present invention, the displacement in the pipe connection direction represented by the universal joint and the ball joint can be reduced.
In the case of seismic isolation piping using a telescopic joint and a pipe connection direction displaceable joint, it is possible to prevent clogging in the mechanism part that constitutes the pipe connection direction displaceable function of both joints and does not adopt the configuration of the present invention. Unlike this, the function can be maintained for a long time.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view illustrating a configuration of a ball joint of a joint capable of being displaced in a pipe connection direction, and FIG.
It is a fragmentary sectional view which expands and shows the circled part of (A).

FIG. 2A is a cross-sectional view illustrating a configuration of a universal expansion joint of a pipe connection direction displacement / expandable joint, and FIG. 2B is an enlarged view of a circled portion of FIG. FIG.

FIG. 3 is a side view showing an example of the seismic isolation pipe connection structure according to the embodiment of the present invention.

FIG. 4 is a side view showing an example of an attachment state of an elbow portion of the seismic isolation pipe connection structure of the present embodiment.

FIG. 5A is a graph showing the relationship between the allowable swing angle of the universal joint and the height of the seismic isolation pit.
(B) is an explanatory view showing a right-angled triangle model for calculating the amount of extension of the universal joint, and (C) is a graph showing the relationship between the allowable swing angle of the universal joint and the amount of extension.

FIG. 6 is an explanatory diagram for calculating an appropriate elongation at the time of absorbing vibration of the seismic isolation pipe connection structure.

FIG. 7A is a side view showing an example of the seismic isolation pipe connection structure of the present embodiment, and FIG. 7B is a partial explanatory view showing a configuration in which a straight pipe is interposed for adjusting the pipe height. It is.

FIG. 8 is a plan view showing a state of the seismic isolation pipe shown in FIG.

FIG. 9 is a plan view showing the movement of the seismic isolation pipe shown in FIG. 7 when absorbing horizontal vibration.

10 is a side view showing a state of vibration absorption of the seismic isolation pipe when the seismic isolation pipe shown in FIG. 7 sinks.

11 is a side view showing a state in which a straight pipe is suspended and supported by the seismic isolation pipe shown in FIG. 7;

FIG. 12 is a side view showing a modified example of the seismic isolation pipe of the present embodiment.

13 is a plan view showing the seismic isolation pipe shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Pipe connection part 2a Flange 2 'Pipe connection part 2'a flange 3 Convex partial spherical part 3a Front half part 3b Rear half part 4a Cylindrical body part 4b Cylindrical cover part 5a Concave partial spherical part 5b Concave part Spherical part 6a Flange 6b Flange 11 Cylindrical body 12 Piping connection part 12a Flange 13 Insertion part 14 Piping connection part 14a Flange 15 Convex partial spherical part 15a Front half 15b Back half 16a Tubular body 16b Tubular cover 17 Concave Partial spherical surface part 17a Concave partial spherical part 17b Concave partial spherical part 18a Flange 18b Flange 21 Upper structure side pipe 21a Upper structure side pipe 21b Flange 22 Lower structure side pipe 22a Lower structure side horizontal pipe 22b Flange 23 Elbow 23a Flange 23b Flange 24 Universal Expansion Join G 25 Flange connection part 26 Pipe mounting pedestal 26a Fixed part 26b Pipe supporting part 26c Buttress 27 Straight pipe 28 Universal expansion joint 29 Elbow 29a Flange 29b Flange 31 Pipe mounting pedestal 32 Band 33 Elbow mounting pedestal 33a Elbow mounting pedestal plate 33b Elbow Fixing member 41 Upper structure side pipe 41a Upper structure side horizontal pipe 42 Lower structure side pipe 42a Lower structure side horizontal pipe 43 Mounting base 44 Band 45 Ball joint 46 Straight pipe 47 Elbow 48 Ball joint 49 Elbow 51 Straight pipe 52 Pipe support 53 Ball joint 54 Suspension support 56 Ball joint 57 Ball joint 58 Ball joint 59 Elbow 61 Elbow 62 Straight pipe 63 Elbow 63a Spring 64 D Bo 65 straight pipe 66 elbow 67 elbow A fitted member B to be inserted member C inserted member D to be inserted member E building body G building foundation side d gap P straight pipe

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiyoshi Suzuki 4-6-115 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Co., Ltd. (72) Tetsuo Yamamoto 4-6-1-15 Sendagaya, Shibuya-ku, Tokyo Stock Company Fujita Co., Ltd. (72) Inventor Kazuhiro Sasaki 3-40-26 Tamagawa, Setagaya-ku, Tokyo F-term in U-E Joint Co., Ltd. (reference) 3H104 JA03 JA17 JB01 JC10 JD09 KA04 KB08 LA14 LA18 LF05 LG03 LG30

Claims (9)

[Claims] An insertion member is rotatably held inside a member to be inserted provided with a pipe connection portion, and a pipe having a pipe connection portion is slidably held inside the insertion member. By using a pipe connection direction displacement / expansion / expansion joint which is allowed to bend and expand / contract in the pipe connection direction, the upper structure of the structure is supported by the lower structure via a seismic isolation device so as to be relatively displaceable. A seismic isolation pipe connection structure in which an upper structure side pipe provided in a structure and a lower structure side pipe or a buried pipe provided in the lower structure are connected, wherein the upper structure side pipe and the lower part At each connection end with a structure side pipe or a buried pipe, the pipe connection direction displacement / expandable joint is provided so that the insertion member is located on the upstream side with respect to the inserted member. The piping connection direction can be displaced and expanded Seismic isolation pipe connection structure pipes between joint, characterized in that it is interposed. 2. An insertion member is rotatably held inside an inserted member provided with a pipe connection portion, and a pipe having a pipe connection portion is slidably held inside the insertion member. Thereby, the pipe connection direction displacement / expandable joint in which the refraction and expansion and contraction of the pipe connection direction are allowed, and the insertion member having the pipe connection portion inside the inserted member provided with the pipe connection portion can be rotated. Using the held pipe connection direction displaceable joint, the upper structure of the structure is supported on the lower structure via a seismic isolation device so as to be relatively displaceable, and the upper structure side piping provided in the upper structure, A seismic isolation pipe connection structure in which a lower structure-side pipe or a buried pipe provided in a lower structure is connected, wherein the connection end of the upper structure-side pipe has a pipe connection direction displacement / expandable joint, Or the pipe connection direction can be displaced One of the hands is connected, the other end is connected to the connection end of the lower structure side pipe or the buried pipe, and when connecting the pipe connection direction displacement / expandable joint, the pipe connection direction displaceable joint, A seismic isolation pipe connection structure, characterized in that, in both joints, the insertion member is provided so as to be located upstream of the member to be inserted, and a pipe is interposed between the two joints. 3. An upper structure of a structure is provided by using a pipe connection direction displaceable joint in which an insertion member having a pipe connection portion is rotatably held inside a member to be inserted provided with a pipe connection portion. Seismic isolation supported on the lower structure via a seismic isolation device so that the upper structure-side piping provided in the upper structure is connected to the lower structure-side piping or the buried piping provided in the lower structure. A pipe connection structure for connecting, at each connection end of the upper structure side pipe and the lower structure side pipe, the pipe connection direction displaceable joint, the insertion member with respect to the inserted member A seismic isolation pipe connection structure provided so as to be located on an upstream side, wherein a pipe is interposed between the joints that can be displaced in the pipe connection direction. 4. The seismic isolation pipe connection structure according to claim 1, wherein in the pipe connection direction displacement / expandable joint, the insertion member and the inserted member are the other with respect to one central axis direction. The center axis direction of the joint is rotatably pivoted at least 15 degrees, and the distance between the centers of rotation of the joints provided at the connection ends of the upper structure side pipe and the lower structure side pipe or the buried pipe is L. , The initial elongation during construction of both joints is d
0, the maximum elongation is d1, the horizontal displacement is D,
When the amount of rotation was ^{θ, d1 ≧ d0 / 2 +} D 2 / {2 (2L + d0)} ≧ 4
(Cm) A seismic isolation pipe connection structure characterized in that the maximum elongation d1 satisfies the above expression. 5. An upper structure side horizontal pipe provided in the upper structure, wherein an upper structure of the structure is supported by the lower structure via a seismic isolation device so as to be relatively displaceable, and a lower structure provided in the lower structure. A side horizontal pipe or a buried horizontal pipe, at least three pipe connection direction displaceable joints in which an insertion member having a pipe connection part is rotatably held inside a member to be inserted provided with a pipe connection part; A bent pipe portion is provided and connected between the upper structure side horizontal pipe and the lower structure side horizontal pipe or the buried horizontal pipe via at least one of an elbow and a straight pipe. A seismic isolation pipe connection structure. 6. The seismic isolation pipe connection structure according to claim 5, wherein the insertion member of the joint that is displaceable in the pipe connection direction is provided so as to be located upstream with respect to the inserted member. A seismic isolation pipe connection structure. 7. The seismic isolation pipe connection structure according to claim 5, wherein the horizontal pipe on the lower structure side is fixed to the lower structure side, and is displaced separately from a fixing portion on the lower structure side. A seismic isolation pipe connection structure which is supported by a pipe displacement support member as much as possible. 8. The fixed structure in the seismic isolation pipe connection structure according to claim 1, wherein an upper structure side horizontal pipe part of the upper structure side pipe is fixed to the upper structure. A fixed structure in a seismic isolation pipe connection structure, wherein a lower structure side horizontal pipe portion of the lower structure side pipe is fixed to the lower structure. 9. The fixing structure in the seismic isolation pipe connection structure according to claim 8, wherein, when fixing the upper structure side horizontal pipe portion to the upper structure, a fixing portion fixed to the upper structure side, and the fixing. In a state where the fixing portion is fixed to the upper structure side via a fixing member including a pipe support portion fixed in a cross direction with respect to the portion, the upper structure side horizontal pipe portion is supported by the pipe support portion. A fixing structure in the seismic isolation pipe connection structure, wherein a pipe end connection part in a pipe end side pipe connection of the upper structure side horizontal pipe part is fixed to the pipe support part.